Yes, had the same issue, had to move my SIMH machine (GORVAX) onto a Leopard box. Sampsa On 6 Jun 2010, at 00:40, Dan Williams wrote: I did have a simh machine on OSX but it stopped working with snow leopard and I didn't have the time to find out why. I also have a copy of decnet for Irix but not a license and I am not familiar enough with it to get it working. If anyone wants a copy let me know. Dan